Environment:
All support OS configured with VMware vCenter Server and ESXi host/s.

Cause:
PowerChute attempts to log in with lower case user name

e.g.
User created in ESXi host and entered in PowerChute as PCNSUSER
When PowerChute contacts the host it enters pcnsuser
The user is rejected since the ESXi host is expecting PCNSUSER (all upercase letters).